Mathematics Integral Calculus Indefinite Integrals

If \(I_n=\displaystyle \int _0^{\pi/4} \tan^n x \:dx \), then what is In + In - 2 equal to?

1
\(\frac{1}{n}\)
2
\(\frac{1}{(n-1)}\)
3
\(\frac{n}{(n-1)}\)
4
\(\frac{1}{(n-2)}\)

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